Grinder system and method for creating a contoured cutting face with a variable axial rake angle

Abstract

Both a grinder system and a corresponding grinding method are based on a module, embodied preferably as a program or program segment, which, preferably automatically, defines the geometry of the corner cutting edge and the corner cutting face of a metal-cutting tool on the basis of predetermined peripheral conditions. The axial rake angle of the face-end cutting edge and the axial rake angle of the circumferential cutting edge as well as a desired effective profile can serve as the predetermined peripheral conditions. Further peripheral conditions may be a smooth transition of the cutting faces between the face-end chip cutting face, corner cutting face and circumferential cutting face. Tools are obtained that have a long service life and with which at the same time good machining quality can be achieved.

1. A grinder system for grinding metal-cutting tools,
 having at least one grinding tool, which is movable by means of a positioning device relative to a metal-cutting tool to be ground, acting as a workpiece, in order to form or machine cutting faces in the metal-cutting tool, 
 having a control unit for controlling the positioning device, wherein the control unit includes: 
 a. a face-end chip space module, for guiding the grinding tool for machining the predetermined face-end chip space; 
 b. a circumferential chip space module, for guiding the grinding tool for machining the predetermined circumferential chip space; and 
 c. a corner chip space module, which from the predetermined face-end cutting edge and the predetermined circumferential cutting edge determines a corner cutting face and for creating this face controls the positioning device accordingly by means of the grinding tool. 
 
   
   
     2. The grinder system of  claim 1 , characterized in that the corner cutting face is flush with the face-end chip cutting face. 
   
   
     3. The grinder system of  claim 1 , characterized in that the corner cutting face is flush with the circumferential cutting face. 
   
   
     4. The grinder system of  claim 1 , characterized in that the corner chip space module ascertains the corner cutting face from a corner cutting edge which is flush with the face-end cutting edge. 
   
   
     5. The grinder system of  claim 1 , characterized in that the corner chip space module ascertains the corner cutting face from a corner cutting edge which is flush with the circumferential cutting edge. 
   
   
     6. The grinder system of  claim 4 , characterized in that the corner chip space module determines the corner cutting edge as a minimal-curvature connecting curve between the face-end cutting edge and the circumferential cutting edge. 
   
   
     7. The grinder system of  claim 6 , characterized in that the corner chip space module, for determining the corner cutting edge, takes a predetermined effective profile of the corner cutting edge into account as an additional predetermining parameter. 
   
   
     8. The grinder system of  claim 6 , characterized in that the corner chip space module, for determining the corner cutting face, takes predetermined corner rake angles into account as additional predetermining parameters. 
   
   
     9. The grinder system of  claim 6 , characterized in that the corner chip space module generates trigger signals for the positioning device, which guides the grinding tool in the transition to the circumferential cutting face with a positive acute angle to the lead angle of the circumferential cutting face, in order to prevent the creation of an undercut. 
   
   
     10. An article of manufacture for grinding metal-cutting tools,
 by means of at least one grinding tool, which is movable by means of a positioning device relative to a metal-cutting tool to be ground, acting as a workpiece, in order to machining chip spaces in the metal-cutting tool, 
 that is executable in a control unit for controlling the positioning device, wherein the grinding program includes: 
 a. a face-end chip space module, for guiding the grinding tool for machining the predetermined face-end chip space; 
 b. a circumferential chip space module, for guiding the grinding tool for machining the predetermined circumferential chip space; and 
 c. a corner chip space module, which from the predetermined face-end chip space and the predetermined circumferential chip space determines a corner cutting face and for creating this face controls the positioning device accordingly by means of the grinding tool. 
 
   
   
     11. An article of manufacture of  claim 10 , characterized in that it causes the corner cutting face to be flush with the face-end chip cutting face. 
   
   
     12. An article of manufacture of  claim 10 , characterized in that it causes the corner cutting face to be flush with the circumferential cutting face. 
   
   
     13. An article of manufacture of  claim 10 , characterized in that the corner chip space module ascertains the corner cutting face from a corner cutting edge which is flush with the face-end cutting edge. 
   
   
     14. An article of manufacture of  claim 10 , characterized in that the corner chip space module ascertains the corner cutting face from a corner cutting edge which is flush with the circumferential cutting edge. 
   
   
     15. An article of manufacture of  claim 13 , characterized in that the corner chip space module determines the corner cutting edge as a minimal- curvature connecting curve between the face-end cutting edge and the circumferential cutting edge. 
   
   
     16. An article of manufacture of  claim 15 , characterized in that the corner chip space module, for determining the corner cutting edge, takes a predetermined effective profile of the corner cutting edge into account as an additional predetermining parameter. 
   
   
     17. An article of manufacture of  claim 15 , characterized in that the corner chip space module, for determining the corner cutting face, takes predetermined corner rake angles into account as additional predetermining parameters. 
   
   
     18. An article of manufacture of  claim 15 , characterized in that the corner chip space module generates trigger signals for the positioning device, which guides the grinding tool in the transition to the circumferential cutting face with a positive acute angle to the lead angle of the circumferential cutting face, in order to prevent the creation of an undercut. 
   
   
     19. An article of manufacture of  claim 10 , characterized in that the corner chip space module is connected to an input module with which predetermining parameters (rake angles α) of the corner cutting face can be input. 
   
   
     20. An article of manufacture of  claim 10 , characterized in that the corner chip space module is connected to an input module with which predetermining parameters of the corner cutting edge can be input. 
   
   
     21. A method for generating or machining a chip space geometry on a metal-cutting tool by a grinding tool, wherein a positioning of the grinding tool is determined by the steps of:
 a. providing first predetermined control data for generating a face-end chip cutting face on the metal-cutting tool, 
 b. providing second predetermined control data for generating a circumferential cutting face on the metal-cutting tool, and 
 c. determining from the first and second control data, third control data for generating a corner cutting face on the metal-cutting tool. 
 
   
   
     22. The method of  claim 21 , characterized in that for determining the shape of the corner cutting face, the point of departure is defined by the course of a corner cutting edge formed at a junction of the corner cutting face and the circumferential cutting face. 
   
   
     23. The method of  claim 22 , characterized in that the course of the corner cutting edge is determined in accordance with the specification of the effective profile R(z) of the corner cutting edge and the specification of the spiral angle S(z), by determining the associated polar angle A(z) from them. 
   
   
     24. The grinder system of  claim 5 , characterized in that the corner chip space module determines the corner cutting edge as a minimal-curvature connecting curve between the face-end cutting edge and the circumferential cutting edge. 
   
   
     25. The article of manufacture of  claim 14 , characterized in that the corner chip space module determines the corner cutting edge as a minimal-curvature connecting curve between the face-end cutting edge and the circumferential cutting edge.